Chlorofluoromethane or Freon 31 is the hydrochlorofluorocarbon (HCFC) with the formula CH₂ClF. It is a colorless, odorless, flammable gas.^[1] It is a class II ozone depleting substance and in accordance with the montreal protocol, its production and import were banned on 1 January 2015.^[2]

Quick Facts Names, Identifiers ...

Chlorofluoromethane

Names
Preferred IUPAC name Chloro(fluoro)methane
Other names Chlorofluoromethane Fluorochloromethane Chloro-fluoro-methane Methylene chloride fluoride Monochloromonofluoromethane CFM Khladon 31 Freon 31 HCFC 31 R 31
Identifiers
CAS Number	593-70-4 N
3D model (JSmol)	Interactive image
ChemSpider	11153 Y
ECHA InfoCard	100.008.914
EC Number	209-803-2
KEGG	C19362 N
PubChem CID	11643
UNII	CUM8OUO53E Y
CompTox Dashboard (EPA)	DTXSID6020305
InChI InChI=1S/CH2ClF/c2-1-3/h1H2 Y Key: XWCDCDSDNJVCLO-UHFFFAOYSA-N Y InChI=1/CH2ClF/c2-1-3/h1H2 Key: XWCDCDSDNJVCLO-UHFFFAOYAV
SMILES C(F)Cl
Properties
Chemical formula	CH2ClF
Molar mass	68.48 g/mol
Appearance	Gas
Density	1.271 kg/m3 at 20 °C
Melting point	−133.0 °C (−207.4 °F; 140.2 K)
Boiling point	−9.1 °C (15.6 °F; 264.0 K)
Henry's law constant (kH)	0.15 mol.kg−1.bar−1
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Carc. Cat. 3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene:^[1]

3 CHCl₂F + 3 CH₂ClF → C₆F₆ + 9 HCl

It was used as a refrigerant and has an ozone depletion potential of 0.02.

Its crystal structure is monoclinic with space group P2₁ and lattice constants a = 6.7676, b = 4.1477, c = 5.0206 (0.10⁻¹ nm), β = 108.205°.^[3]

At an altitude of 22 km, traces of chlorofluoromethane occur (148 ppt).^[4]